题解 | #下象棋#

解题思路：
1. 分情况讨论即可
1.1 找到对应j的位置
1.2 j上下左右是否有B或J
2.3 j上下左右四个方向是否有C，且无遮挡物
3.4 j上下左右四个方向是否有P，且有一个遮挡物

class Solution:
    def playchess(self , chessboard ):
        # write code here
        row, col = len(chessboard), len(chessboard[0])
        # 1. 定位小j
        location_j = (0, 0)
        for i in range(row):
            for j in range(col):
                if chessboard[i][j] == 'j':
                    location_j = (i, j)
                    break

        # 2. j上下左右是否有B或J
        up_location = (location_j[0]-1, location_j[1])
        down_location = (location_j[0]+1, location_j[1])
        left_location = (location_j[0], location_j[1]-1)
        right_location = (location_j[0], location_j[1]+1)
        if up_location[0] >= 0 and chessboard[up_location[0]][up_location[1]] in list("BJ"):
            return "Happy"
        if down_location[0] < row and chessboard[down_location[0]][down_location[1]] in list("BJ"):
            return "Happy"
        if left_location[1] >= 0 and chessboard[left_location[0]][left_location[1]] in list("BJ"):
            return "Happy"
        if right_location[1] < col and chessboard[right_location[0]][right_location[1]] in list("BJ"):
            return "Happy"

        # 3. j上下左右四个方向是否有C，且无遮挡物
        for up in range(location_j[0]-1, -1, -1):
            if chessboard[up][location_j[1]] == ".":
                continue
            elif chessboard[up][location_j[1]] == "C":
                return "Happy"
            else:
                break
        for left in range(location_j[1]-1, -1, -1):
            if chessboard[location_j[0]][left] == ".":
                continue
            elif chessboard[location_j[0]][left] == "C":
                return "Happy"
            else:
                break
        for down in range(location_j[0]+1, row):
            if chessboard[down][location_j[1]] == ".":
                continue
            elif chessboard[down][location_j[1]] == "C":
                return "Happy"
            else:
                break
        for right in range(location_j[1]+1, col):
            if chessboard[location_j[0]][right] == ".":
                continue
            elif chessboard[location_j[0]][right] == "C":
                return "Happy"
            else:
                break

        # 4. j上下左右四个方向是否有P，且有一个遮挡物
        block = 0
        for up in range(location_j[0]-1, -1, -1):
            if chessboard[up][location_j[1]] == ".":
                continue
            elif chessboard[up][location_j[1]] == "P" and block == 1:
                return "Happy"
            else:
                block += 1
                if block >= 2:
                    break
        block = 0
        for left in range(location_j[1]-1, -1, -1):
            if chessboard[location_j[0]][left] == ".":
                continue
            elif chessboard[location_j[0]][left] == "P" and block == 1:
                return "Happy"
            else:
                block += 1
                if block >= 2:
                    break
        block = 0
        for down in range(location_j[0]+1, row):
            if chessboard[down][location_j[1]] == ".":
                continue
            elif chessboard[down][location_j[1]] == "P" and block == 1:
                return "Happy"
            else:
                block += 1
                if block >= 2:
                    break
        block = 0
        for right in range(location_j[1]+1, col):
            if chessboard[location_j[0]][right] == ".":
                continue
            elif chessboard[location_j[0]][right] == "P" and block == 1:
                return "Happy"
            else:
                block += 1
                if block >= 2:
                    break


        return "Sad"